Corrosion resistance of dysprosium titanate powders and tablets in the model environment of the coolant of the WWER-1000

Keywords

dysprosium titanate, corrosion resistance, pellets, powder, density.

Cite as

Chernov І. О., Zuyok V. А., Grytsyna V. М., Belash М. М., and Kolodiy І. V. Corrosion resistance of dysprosium titanate powders and tablets in the model environment of the coolant of the WWER-1000. Physicochemical Mechanics of Materials. 2023. 59(1), 100-103.

https://doi.org/10.15407/pcmm2023.01.100

Abstract

The results of autoclave tests of corrosion resistance of dysprosium titanate powders and pellets in the model environment and the parameters of the primary coolant of the WWER-1000 reactor are presented. It is found that when exposed to an autoclave for up to 500 h, the powders are characterized by a decrease in weight, which does not exceed 0.5%, and its weight gain depends on their density. Pellets with the highest density (7.1–7.2 g/cm³) are characterized by the highest corrosion resistance. Corrosion kinetics of dysprosium titanate pellets with a density of 5.74–5.79 g/cm³ is characterized by a monotonous weight gain with increasing exposure in the autoclave. After 2300 h of autoclaving, the average increase was ~156 mg/dm² (0.3%). The change in the phase composition of powders and pellets of dysprosium titanate after corrosion tests is not detected. Studies of the conditions of defective absorber elements models after autoclave tests have shown that they retain their integrity without changing the linear dimensions. After cutting the absorber elements models, the powders are freely removed from the cladding. The change in the phase composition of the powders is also not detected.

References

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